healthKit的一些知识点

HealthKit

HKUnit
HKUnit *g = [HKUnit gramUnit];
HKUnit *dL = [HKUnit literUnitWithMetricPrefix:HKMetricPrefixDeci];
HKUnit *gPerdL = [g unitDividedByUnit:dL];

HKQuantity
HKUnit *gramUnit = [HKUnit gramUnit];
HKQuantity *grams = [HKQuantity quantityWithUnit:gramUnit doubleValue:20];
double kg = [grams doubleValueForUnit:[HKUnit unitFromString:@"kg"]];

BOOL kgCompatible = [grams isCompatibleWithUnit:[HKUnit unitFromString:@"kg"]];
BOOL kCalCompatible = [grams isCompatibleWithUnit:[HKUnit kilocalorieUnit]];

HKObject
NSString *identifier = HKQuantityTypeIdentifierBodyTemperature;
HKQuantityType *tempType = [HKQuantity quantityWithUnit:[HKUnit degreeFahrenheitUnit] doubleValue:98.6];
NSDictionary *meta = @{HKMetadataKeyBodyTemperatureSensoLocation:
@(HKBodyTemperatureSensorLocationEar)};
HKQuantitySample *temperatureSample = [HKQuantitySample QuantitySampleWithType:tempType
								quantity:myTemp
								startDate:[NSDate date]
								endDate:[NSDate date]
								metadata:meta];

HKHealthStore
self.store = [[HKHealthStore alloc] init];
HKQuantitySample *mySample = [self newSample];
[self.store saveObject:mySample withCompletion:^(BOOL success,NSError *error) {
	if (success) {

	}
}];

HKQuery --- Predicates
HKQuantity *weight = [NSPredicate predicateWithFormat:@"%K > %@",
					HKPredicateKeyPathQuantity,weight];

HKAnchoredObjectQuery
self.lastAnchor = 0;
HKAnchoredObjectQuery *query;
query = [[HKAnchoredObjectQuery alloc] initWithType:bloodSugar
						Predicate:nil
						anchor:self.lastAnchor
						limit:HKObjectQueryNoLimit
						CompletionHandler:^(HKAnchoredObjectQuery *query,
							NSArray *results,
							NSUInteger newAnchor,
							NSError *error) {
							self.lastAnchor = newAnchor;
							NSLog(@"Results:%@",results);
						}];